The Stark Law says that you can’t be in an arrangement that encourages referrals to entities that you own or have an investment interest.  In group practices, the law places constraints on your compensation for in-house referrals.  It states that your compensation can not be related to the utilization of the in-house referrals.  The law allows for allocation that are determined before the services were available and meets certain requirements. Much has been written about the Stark Law which you can find on the web.